Device for cutting sheet glass



Patented Aug. 26, 1930 UNITED STATES PATENT OFFICE PIERRE YZBREDIN, orSTOLBERG, GERMANY, ASSIGNoE, BY MESNE ASSIGNMENTS, 'ro THEAMEEIcaNEIcnEEoUx COMPANY, A conronn'rron DELAWARE nEvIcE FOR cu'r'rmesH E'r GLASS.

Application filed April 22 1929,.Seria1 No. 357,117, and in Germany May18 1928.

This invention relates to a new and improved device for cutting sheetglass into separateunits, while in a plastic condition.

For cutting plastic sheet glass, devices have 5 already been used whichconsist of a circular knife which is moved along and in shearingengagement with an edge of the support carrying the glass andconsisting, for ,in-

stance, of stationar casting tables or traveling transporting ta les.These known knives are generally constructed as double knives whichworksimultaneously at two oppositely disposed edges and cut' a strip out ofthe lass. e lastic to allow them to bear with tension against theshearing or cutting edges in order to attain smooth strai ht cuts.

It'is the object of t e invention to provide a cutting device of thekind stated in which the knife, which consists onl of a'single circulardisk, needs no longer e elastic as-the knives of the known devices. Thisobject is attained by forming the cutting edge of the knife through abevel provided on that side of the disk. which is not in contact withthe shearing edge and causingthe knife to ride during the cuttingoperation with the beveled portion on a supporting and guiding edgedisposed parallelly of; the shearing edge. cutting device constructed inthis mannor has a longer. life than the known devices,

, and it allows to effect sharp and straight cuts without itbeingnecessary to cut a strip out of the glass.

the invention is illustrated in the accompanying drawing. Fig. l is afront view of the cutting device, Fig. 2 is an end view of the device,partly in section, and Fig. 3 is a frac- 40 tional longitudinal sectionof a glass support with a modified arrangement of the Shearing andguiding edges with which the knifecooperates.

Referring now to the drawing in detail, a is the circular knife which ismounted for rota- The blades of these knives must be straight andsmooth-cuts.

An embodiment of the subject-matter of 'of travel of the tables duringthe cutting tion in a frame d. This frame is loaded by weights 0 andadapted to be moved to and fro by means of a rod 6 or the like. Theframe d is provided in its upper portion with two rollers f, which arepreferably somewhat staggered with relation to each other and adapted torun in a grooved guide rail g.

Arranged in the glass support-at the'place where the glass is to be cut,are two parallel ledger bars 71. and i which leave a small gap betweeneachother. The barh forms the: shearing edge desi' ed to co act with theknife a. .The cutting edge. of theknife is formed by a bevel a which isprovided on that'sicle of the knife which is turned away from the bar orshearing edge It. During the cutting operation the knife a rides vwiththe beveled portion a on the edge of the bar 5 which serves, to Supportand guide the knife. Owing to. this beveled portion resting on the,bar-"21 during the cutting, theweight of the cutting device causes theknife a to be constantly pressed a ainst the shearing edgeformed by thear h," thereby ensuring c The two bars h and 41 maybe fixed on a commonsupporting ledge 70, as shownin Fig. 2. If the support for the, glassconsists of a number of stationar or traveling tables, such @a ledge kis fastens to one-end of each'table.

As shown in Fig. 3, thelbar h can-also'be fastened to one end of a tableZ and the other bar 2' to the adjacent end of the following table lk r IIn case traveling transporting tables. are used and it is desired to cutthe glass sheet while being carried ahead by the tables,'.the cuttingdevice has imparted to it ina' wellknown manner a movement in thedirection operation.

Having thus described my invention, what I claim as new and desire tosecure by Letters- Patent is A device for cutting sheet glass,comprising in combination a sup art for the glass, a

pan of spaced parallel e ges in the support,

a circular knife movable across the support .along the parallel edgesand in contact-therewith, the knife having its cutting edge formed by abevel on one of its sides, one of the said edges of the support forminga shearing edge to cooperate with the knife in severing the glass, andthe other edge forming a guiding and supporting edge on which thebeveled portion of the knife rides, during the cutting movement over theglass.

In testimony whereof I have signed my name to this specification.

PIERRE BREDIN.

